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Table B.2, “Microsoft proprietary extensions to CSS” lists
Microsoft’s proprietary extensions to the specifications. These properties
will not validate if you run them through a validator and they will appear
successfully only in a browser built by Microsoft. Your mileage will vary
with the use of these extensions.

As of this writing, Mozilla’s proprietary extensions that are
available in Mozilla, Firefox, and Netscape Navigator 6 and later browsers
are not fully documented. Table B.3, “Mozilla CSS property extensions”
lists some extensions that are documented from Mozilla’s developers’
website. Check the site for a complete list of the extensions, at http://developer.mozilla.org/en/docs/CSS_Reference:Mozilla_Extensions.